SPELAB Exhaust Header for 1964-1970 Ford SBF Mustang 289 302 351 Replacing or upgrading your exhaust header is necessary for both engine performance and sound. Whether on or off the track, exhaust headers provide more horsepower and improved exhaust sound. SPELAB offers many products to help you create your own custom engine headers. It's really easy and convenient to use: direct bolt-on, no modification needed. Fitment: For Ford Sb 289 302 351 Windsor Mustang 1964-1970 For 1964-1970 Ford Mustang with Small Block 260, 289, 302 and 351 engines(except 1966 Ford Mustang,1969 Ford Mustang) Specifications: Brand Name: SPELABCertificate: SPES08236Application: Automobile Exhaust HeaderMaterial: Stainless SteelSurface: Mirror PolishModel:EH28102 Increase high flow air, instantly gain 10 to 15 Hp. / Tq. Primary Tube Diameter (in): 1 5/8 in.Collector Attachment: 3-Bolt FlangeCollector Diameter:3.000 in.Primary Tube Gauge:16 Gauge3/8" flanges and 3" collectorsFlange Style: StandardFlange Thickness (in): 5/16 in. Exhaust Header VS Manifold, which is the better choice? The structural differences between exhaust headers and manifolds are the material and size. From the material, exhaust headers are made of lighter, thinner steel, while exhaust manifolds are made of thick iron. Exhaust headers are also longer than exhaust manifolds. When in use, exhaust manifolds create back pressure, which lowers performance. Because each cylinder of the engine is given its own tube, however, headers eliminate this problem; thus, allowing the gases to exit without the creation of back pressure. Therefore, exhaust headers are a BETTER choice than an exhaust manifold.